linux-kernel - Re: [PATCH] irqchip/mbigen: Free msi

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Message-ID: <c308446a-557f-8fe1-520e-45558dd3aac5@huawei.com>
Date:   Thu, 9 Apr 2020 18:30:33 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <wuyun.wu@...wei.com>,
        <wanghaibin.wang@...wei.com>
Subject: Re: [PATCH] irqchip/mbigen: Free msi_desc on device teardown

Hi Marc,

On 2020/4/9 17:27, Marc Zyngier wrote:
> On Wed, 8 Apr 2020 19:43:52 +0800
> Zenghui Yu <yuzenghui@...wei.com> wrote:
> 
> Hi Zenghui,
> 
>> Using irq_domain_free_irqs_common() on the irqdomain free path will
>> leave the MSI descriptor unfreed when platform devices get removed.
>> Properly free it by MSI domain free function.
>>
>> Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
>> ---
>>   drivers/irqchip/irq-mbigen.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
>> index 6b566bba263b..ff7627b57772 100644
>> --- a/drivers/irqchip/irq-mbigen.c
>> +++ b/drivers/irqchip/irq-mbigen.c
>> @@ -220,10 +220,16 @@ static int mbigen_irq_domain_alloc(struct irq_domain *domain,
>>   	return 0;
>>   }
>>   
>> +static void mbigen_irq_domain_free(struct irq_domain *domain, unsigned int virq,
>> +				   unsigned int nr_irqs)
>> +{
>> +	platform_msi_domain_free(domain, virq, nr_irqs);
>> +}
>> +
>>   static const struct irq_domain_ops mbigen_domain_ops = {
>>   	.translate	= mbigen_domain_translate,
>>   	.alloc		= mbigen_irq_domain_alloc,
>> -	.free		= irq_domain_free_irqs_common,
>> +	.free		= mbigen_irq_domain_free,
>>   };
>>   
>>   static int mbigen_of_create_domain(struct platform_device *pdev,
> 
> Should this deserve a:
> 
> Fixes: 9650c60ebfec0 ("irqchip/mbigen: Create irq domain for each
> mbigen device")

Yes, please help to add it.

> 
> Otherwise queued for post -rc1.

Thanks!


Zenghui